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分别以亮氨酸(Leu)、精氨酸(Arg)、赖氨酸(Lys)、丙氨酸(Ala)和谷氨酰胺(Gln)等5种氨基酸为底物,研究了氨基酸-BrO3--Mn2+-H2SO4-丙酮体系的化学振荡反应。通过所获得的该振荡体系的振荡波形、振荡诱导期tin及振荡周期tp数据,估算了动力学参数(诱导期及周期的速率常数Kin、Kp、表观活化能Ein、Ep及指前因子Ain、Ap),进而依据Oregonator模型及不可逆过程热力学理论,获得了5种氨基酸在该振荡体系的热力学函数(ΔHin、ΔGin、ΔSin及ΔHp、ΔGp、ΔSp)。结果表明,该振荡体系的诱导期和周期的熵变ΔSin和ΔSp均为负值,证明该体系下化学振荡反应是具有耗散结构的非平衡态体系,进一步得到氨基酸振荡过程中能量变化规律以及结构和能量变化规律之间的关系。
Five amino acids, Leu, Arg, Lys, Ala and Gln, were used as substrates to study the effects of amino acids -BrO3- -Mn2 + -H2SO4-acetone system of chemical oscillation reaction. The kinetic parameters (induction rate and cycle rate constants Kin, Kp, apparent activation energy Ein, Ep, and pre-exponential factor Ain were estimated from the oscillation waveforms, the oscillation induction period tin and the oscillation period tp data. , Ap). Based on the Oregonator model and the irreversible thermodynamic theory, the thermodynamic functions (ΔHin, ΔGin, ΔSin and ΔHp, ΔGp, ΔSp) of the five kinds of amino acids in the oscillation system were obtained. The results show that the entropy change ΔSin and ΔSp during the induction period and the period of the oscillatory system are both negative. It is shown that the chemical oscillatory reaction is a non-equilibrium system with dissipative structure, and the energy variation law during the oscillation of the amino acid is obtained. Relationship between structure and energy variation.